What is the function of an ambient air temperature sensor?
The ambient (ATC) or outside air temperature sensor is an (NTC) negative temperature coefficient sensor that informs the semiautomatic/automatic temperature control system of outside air temperature.
What to do if your ambient temperature sensor is not working?
1. The AC auto mode will not work Most modern vehicles have an auto AC setting that will allow the vehicle to automatically set and regulate the temperature. The AC system will simply read the ambient and cabin temperature sensors data and continuously cycle the AC system on and off as required to keep the cabin cool.
How does a sensor change with ambient light?
The sensor used in the circuit is an LDR (light-dependent resistor), and the resistance of this will change with ambient light strength. When the sensor is in darkness, then the resistance will be decreased from millions of ohms in darkness as well as few hundreds of ohms in clear light.
How does the NTC air temperature sensor work?
The NTC sensor’s resistance decreases as the outside air temperature increases. The computer uses this input, along with other in-car temperature sensors, to control temperature and blower speed. When there’s a problem with this sensor, performance suffers, and the compressor’s clutch may not engage.
The ambient (ATC) or outside air temperature sensor is an (NTC) negative temperature coefficient sensor that informs the semiautomatic/automatic temperature control system of outside air temperature.
1. The AC auto mode will not work Most modern vehicles have an auto AC setting that will allow the vehicle to automatically set and regulate the temperature. The AC system will simply read the ambient and cabin temperature sensors data and continuously cycle the AC system on and off as required to keep the cabin cool.
Why is the outside air temperature sensor stuck at 50 degrees?
The temperature reading next to the clock is constantly stuck at 50 degrees. The outside temperature is above 80 degrees so there is definitely a problem. I can’t even figure out where the sensor is located to check for a loose connection.
The NTC sensor’s resistance decreases as the outside air temperature increases. The computer uses this input, along with other in-car temperature sensors, to control temperature and blower speed. When there’s a problem with this sensor, performance suffers, and the compressor’s clutch may not engage.
Where is the air temperature sensor on a grill?
In the illustration, the ambient air temperature sensor is located behind the grill. It’s typically located behind the grill or front bumper. This is why they’re sometimes damaged in a front end collision.
What kind of sensor does an air conditioner use?
Use a multimeter and verify the manufacturer’s specifications (~ 220-240 ohms at 70°-80° F), to test this sensor for proper resistance. Automotive air conditioning systems use NTC sensors to monitor air temperature.